CN106022325A - Optical fingerprint sensor module - Google Patents
Optical fingerprint sensor module Download PDFInfo
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- CN106022325A CN106022325A CN201610637766.XA CN201610637766A CN106022325A CN 106022325 A CN106022325 A CN 106022325A CN 201610637766 A CN201610637766 A CN 201610637766A CN 106022325 A CN106022325 A CN 106022325A
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- transparent substrates
- light
- fingerprint sensor
- backlight
- optical fingerprint
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1341—Sensing with light passing through the finger
Abstract
An optical fingerprint sensor module comprises a first light-transmitting substrate, a second light-transmitting substrate located below the first light-transmitting substrate, and a backlight source located below the first light-transmitting substrate. The backlight source is located on the lateral side of the second light-transmitting substrate. The optical fingerprint sensor module further comprises a fingerprint sensing layer which is located on the lower surface of the second light-transmitting substrate. The performance of the optical fingerprint sensor module is improved, and the quality of a fingerprint image obtained through the optical fingerprint sensor module is improved.
Description
Technical field
The present invention relates to optical finger print identification field, particularly relate to a kind of optical fingerprint sensor module.
Background technology
Fingerprint imaging identification technology, is the fingerprint image being collected human body by fingerprint sensor, then with
Existing fingerprint imaging information in system is compared, and whether carrys out correct judgment, and then realizes identification
Technology.The convenience used due to it, and the uniqueness of somatic fingerprint, fingerprint identification technology is
It is widely used in every field.The such as field of safety check such as public security bureau, customs, the gate control system of building, with
And the consumer product area such as PC and mobile phone etc..
The implementation of fingerprint imaging identification technology has optical imagery, capacitance imaging, ultra sonic imaging etc. multiple
Technology.Comparatively speaking, optical finger print imaging technique, its imaging effect is relatively preferable, and equipment cost is relative
Relatively low.
The structure of existing optical fingerprint sensor module haves much room for improvement, and performance has much room for improvement.
Summary of the invention
The problem that the present invention solves is to provide a kind of optical fingerprint sensor module, refers to improving described optics
The performance of stricture of vagina sensor module, thus improve the fingerprint image using described optical fingerprint sensor module to obtain
Picture element amount.
For solving the problems referred to above, the present invention provides a kind of optical fingerprint sensor module, including: first is saturating
Photopolymer substrate；Second transparent substrates, is positioned at below described first transparent substrates；Backlight, is positioned at described
Below one transparent substrates；Described backlight is positioned at the side of described second transparent substrates；Described optical finger print
Sensor module also includes that fingerprint sensing layer, described fingerprint sensing layer are positioned at described second transparent substrates following table
Face.
Optionally, the light that described backlight sends enters described the from the side of described second transparent substrates
Two transparent substrates, then enter described first transparent substrates from described second transparent substrates, and described first
Transparent substrates upper surface occurs partially reflective, and reflection light returns to through after described first transparent substrates
Enter described second transparent substrates, then enter described fingerprint sensing layer from described second transparent substrates.
Optionally, the side of described second transparent substrates with the angle of described second transparent substrates upper surface is
On-right angle.
Optionally, described first transparent substrates is single layer structure or multiple structure；Described first printing opacity base
Plate lower surface has light shield layer, and described light shield layer is being introduced into for the light preventing described backlight from sending
Described second transparent substrates advance into described first transparent substrates.
Optionally, when described first transparent substrates is single layer structure, described first transparent substrates upper surface,
Under described first transparent substrates lower surface, described second transparent substrates upper surface and described second transparent substrates
At least one of which surface on surface has filter layer；When described first transparent substrates is multiple structure,
Described first transparent substrates comprises multiple submounts, described submounts upper surface, described submounts lower surface,
At least one of which surface tool of described second transparent substrates upper surface and described second transparent substrates lower surface
There is filter layer.
Optionally, described second transparent substrates and described fingerprint sensing layer composition optical fingerprint sensor；Or
Person, described first transparent substrates, described second transparent substrates and described fingerprint sensing layer composition optical finger print
Sensor.
Optionally, having collecting lens before the exiting surface of described backlight, described collecting lens can make
The light of described backlight is converted to directional light or nearly directional light, and the light of described backlight first passes through described
Collecting lens, then arrive the side of described second transparent substrates.
Optionally, it is anti-reflection that the side that described second transparent substrates emits beam for receiving backlight has light
Layer, described smooth antireflection layer can increase the ratio of light described second transparent substrates of entrance of described backlight.
Optionally, the side that described second transparent substrates emits beam for receiving backlight is caustic surface,
The light that described backlight sends is converted to directional light or nearly directional light by described caustic surface.
Optionally, described caustic surface is inclined-plane, spherical crown surface, ellipsoid crown, conical side surface or pyramid side
Face.
Optionally, described caustic surface has light antireflection layer, and described smooth antireflection layer can increase described backlight
Light enter described light transmission medium ratio.
Optionally, described backlight includes plural LED, said two or two or more LED
Lamp is evenly distributed in the lower section of described protective layer, the light of described LED be black light, purple light,
Blue light, green light, sodium yellow, red light, near infrared light or white light.
Compared with prior art, technical scheme has the advantage that
In technical scheme, it is positioned at below the first transparent substrates by arranging the second transparent substrates,
Arrange backlight to be positioned at below the first transparent substrates, and backlight be positioned at the side of the second transparent substrates,
Fingerprint sensing layer is positioned at described second transparent substrates lower surface.This structure makes the light that backlight sends
When reflecting through the interface of the first transparent substrates upper surface, need also cross the second transparent substrates
Fingerprint sensing layer just can be arrived with the first transparent substrates.Now, described optical fingerprint sensor module is abundant
Make use of the thickness of the second transparent substrates self, therefore in the case of need not increase extra transparent substrates,
Finger print just can be made just can to increase to the distance between fingerprint sensing layer, expand fingerprint sensing layer
Receive the width of ray regions, thus improve the fingerprint image quality that optical fingerprint sensor module gathers.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of optical fingerprint sensor module；
Fig. 2 is the schematic top plan view of the optical fingerprint sensor module that first embodiment of the invention is provided；
Fig. 3 is the optical fingerprint sensor module generalized section that first embodiment of the invention is provided；
Fig. 4 is the optical fingerprint sensor module generalized section that second embodiment of the invention is provided；
Fig. 5 is the optical fingerprint sensor module generalized section that third embodiment of the invention is provided；
Fig. 6 is the optical fingerprint sensor module generalized section that fourth embodiment of the invention is provided；
Fig. 7 is the optical fingerprint sensor module generalized section that fifth embodiment of the invention is provided.
Detailed description of the invention
A kind of optical fingerprint sensor module is as it is shown in figure 1, include protective layer 100, optical fingerprint sensor
110 and backlight 120.Backlight 120 is positioned at below protective layer 100, and optical fingerprint sensor 110 is straight
Connecing contact layer and be laminated on below protective layer 100, optical fingerprint sensor 110 includes fingerprint sensing layer 111 and base
Plate 112.Fingerprint sensing layer 111 is positioned at substrate 112 upper surface, i.e. fingerprint sensing layer 111 and is positioned at substrate 112
And between protective layer 100.Backlight 120 is positioned at the side of optical fingerprint sensor 110.Now, the back of the body
The angle of incidence a that the light that light source 120 sends is irradiated into protective layer 100 is less, therefore, and optical finger print
In sensor 110, fingerprint sensing layer 111 is able to receive that the peak width A of reflection light is less, causes
Fingerprint sensing layer 111 major part region cannot apply to fingerprint image acquisition, and therefore shown in Fig. 1, optics refers to
Stricture of vagina sensor module performance has much room for improvement, the fingerprint image that optical fingerprint sensor module shown in Fig. 1 collects
Picture element amount has much room for improvement.
More importantly, in order to gather higher-quality fingerprint image, it is often desirable that arrive at incident ray
When reaching protective layer 100 upper surface, it is possible at the first interface (fingerprint of protective layer 100 upper surface Yu air
Air is had between paddy position and protective layer 100 upper surface) it is totally reflected, and at protective layer 100
Upper surface and the second contact surface of fingerprint tough position (fingerprint ridge position can be with protective layer upper surface)
Be normally carried out refraction and reflection (not being totally reflected), thus improve fingerprint diverse location (paddy position and
Ridge position) contrast, improve fingerprint image quality.And the fingerprint sensor module shown in Fig. 1 cannot
Realizing above-mentioned first interface occurs total reflection and second contact surface that the situation of total reflection, therefore, Fig. 1 do not occur
Shown optical fingerprint sensor module cannot improve fingerprint image quality.
To this end, the present invention provides a kind of optical fingerprint sensor module, described optical fingerprint sensor module
Including the first transparent substrates, the second transparent substrates and fingerprint sensing layer, wherein, the second transparent substrates and referring to
Stricture of vagina sensed layer broadly falls into the structure of fingerprint sensor.By by the second transparent substrates in fingerprint sensor and
Fingerprint sensing layer upper-lower position exchange (upper and lower relation of this specification be typically with finger in the top
Definition), (usual fingerprint sensed layer is positioned at second to make fingerprint sensing layer be positioned at the second transparent substrates lower surface
Transparent substrates upper surface) so that the second transparent substrates in fingerprint sensor also becomes fingerprint reflection light
Line needs the structure of process.Therefore, in the case of need not increase other additional substrate, it becomes possible to increase
Big first transparent substrates upper surface is to the distance of fingerprint sensing layer.Expand described distance to expand optics and refer to
Stricture of vagina sensor receives the width of ray regions, thus improves the fingerprint image that optical fingerprint sensor module gathers
Picture element amount.
Understandable, below in conjunction with the accompanying drawings for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
The specific embodiment of the present invention is described in detail.
First embodiment of the invention provides a kind of optical fingerprint sensor module, incorporated by reference to referring to figs. 2 and 3.
Fig. 2 is the schematic top plan view of described optical fingerprint sensor module.Fig. 3 is that optical finger print shown in Fig. 2 passes
The generalized section that sensor module obtains along DD chain-dotted line cutting.
Refer to Fig. 2 and Fig. 3, described optical fingerprint sensor module include the first transparent substrates 200,
Two transparent substrates 212, backlight 220 and fingerprint sensing layer 211.Second transparent substrates 212 is positioned at first
Below transparent substrates 200.Backlight 220 also is located at below the first transparent substrates 200.Backlight 220
It is positioned at the side of the second transparent substrates 212.Fingerprint sensing layer 211 is positioned at the second transparent substrates 212 following table
Face.
In the present embodiment, the second transparent substrates 212 and fingerprint sensing layer 211 form optical fingerprint sensor
210.Optical fingerprint sensor 210 can be the image sensing made with TFT technique based on glass substrate
Device.
In other embodiments, optical fingerprint sensor can include other structure.Work as optical fingerprint sensor
When can include other structure, the second transparent substrates and fingerprint sensing layer is optical fingerprint sensor one
Point, i.e. optical fingerprint sensor includes the second transparent substrates and fingerprint sensing layer.
It should be noted that in Fig. 2, optical fingerprint sensor 210 and backlight 220 use dashed graph
Display, because they are actually covered by the first transparent substrates 200.
It should be noted that in other embodiments, overlook on direction, the first transparent substrates can not cover
Lid backlight.
In the present embodiment, the first transparent substrates 200 is specifically as follows the protection cap of mobile phone or panel computer
Plate etc..I.e. first transparent substrates 200 is not belonging to a portion of optical fingerprint sensor 210, but still
So belong to a part for described optical fingerprint sensor module.
In the present embodiment, the material of the first transparent substrates 200 can be glass or plastics etc..Second is saturating
The material of photopolymer substrate 212 can also be glass or plastics etc..
Refer to Fig. 3, the light (as indicated by the arrows in fig. 3) that backlight 220 sends is from the second printing opacity
The side of substrate 212 enters the second transparent substrates 212, and (this process normal daylight has the change of certain angle
Changing, for simplicity, not shown angle changes), then enter the first transparent substrates 200 from the second transparent substrates 212
(when the first transparent substrates 200 is different with the refractive index of the second transparent substrates 212, the angle of light is led to
Often also can change), and occur partially reflective at the first transparent substrates 200 upper surface, reflection light is saturating
Return to after crossing the first transparent substrates 200 enter the second transparent substrates 212, then from the second transparent substrates
212 enter fingerprint sensing layer 211.It is to say, the light that the present embodiment makes backlight 220 send is first
Enter the second transparent substrates 212 from the side of the second transparent substrates 212, then enter back into the first transparent substrates
200, it is to avoid it is saturating that the light that backlight 220 sends is put into first before being introduced into the second transparent substrates 212
Photopolymer substrate 200.
It should be noted that owing to the side of the second transparent substrates 212 is the plane of incidence of light, so to this
The flatness in individual face there are certain requirements, in order to makes light uniformly effectively enter the second transparent substrates 212.Second
The side of transparent substrates 212 can be right-angle surface, i.e. as it is shown on figure 3, the side of the second transparent substrates 212
Face is at a right angle with the upper surface of second substrate 212.
In other embodiments, the side of the second transparent substrates 212 can also be non-right-angle surface, is tiltedly
Face, so convenient this side of processing.It addition, when described side is inclined-plane, it is also possible to adjust this
Flank angle so that the incident angle of major part incident illumination enters close to zero degree (i.e. close to vertical incidence)
It is mapped to the second transparent substrates 212, to increase the impingement rate of light.
Refer to Fig. 3, the first transparent substrates 200 lower surface has light shield layer 240, and light shield layer 240 is used for
Prevent light that backlight 220 sends from advancing into the first printing opacity base be introduced into the second transparent substrates 212
Plate 200.It is to say, the light that light shield layer 240 sends for ensureing backlight 220 is first from the second printing opacity
The side of substrate 212 enters the second transparent substrates 212, then enters back into the first transparent substrates 200.Shading
Layer 240 can use ink coating to be formed, it would however also be possible to employ other suitable material and mode are formed.
It should be noted that in order to ensure that the light that backlight sends first enters from the side of the second transparent substrates
Enter the second transparent substrates, then enter back into the first transparent substrates, in other embodiments, it is also possible to by control
The light direction of backlight processed and rising angle scope so that light only can be first from the side of the second transparent substrates
Face enters the second transparent substrates, and (light such as making backlight send only irradiates the side of the second transparent substrates
Face), enter back into the first transparent substrates.
Above-mentioned " ensure that the light that backlight sends first enters the second printing opacity base from the side of the second transparent substrates
Plate, then enters back into the first transparent substrates ", its objective is to prevent from " being put into without the second transparent substrates
The light of the first transparent substrates, is irradiated to fingerprint with the reflection angle and position being different from ' required light '
Sensed layer, causes fingerprint image to fog ".Wherein, " required light " refer to that backlight sends from second
The side of transparent substrates enters the light of the second transparent substrates.
In the present embodiment, the first transparent substrates 200 is single layer structure.Now on the first transparent substrates 200
Surface, the first transparent substrates 200 lower surface, the second transparent substrates 212 upper surface and the second transparent substrates
At least one of which surface of 212 lower surfaces can have filter layer.Described filter layer may be used for filtering ring
Border light or change the first transparent substrates 200 or appearance color of the second transparent substrates 212.
In other embodiments, the first transparent substrates can also be multiple structure.When the first transparent substrates is many
During Rotating fields, the first transparent substrates can comprise multiple submounts, now, described submounts upper surface,
Described submounts lower surface, the second transparent substrates upper surface and the second transparent substrates lower surface are at least within
One surface has filter layer.
In the present embodiment, backlight 220 is positioned at the left side of optical fingerprint sensor 210.
In other embodiments, backlight can also be positioned at other side of optical fingerprint sensor.
In the present embodiment, the position of backlight 220 higher than or wait higher than fingerprint sensing layer 211, thus prevent
The light that only backlight 220 sends enters fingerprint sensing layer 211 from the lower surface of fingerprint sensing layer 211.
In other embodiments, prevent light from shining from lower surface when fingerprint sensing layer is internally provided with light-shielding structure
When being mapped to its photo-sensitive cell, the position of backlight with can be less than fingerprint sensing layer.
Understand in conjunction with Fig. 2 and Fig. 3, when backlight 220 is positioned at the side of optical fingerprint sensor 210,
The light that backlight 220 sends without other solid dielectric, but can be arrived by air or vacuum
The side of the second transparent substrates 212, thus be conducive to reducing described optical fingerprint sensor modular volume,
Be conducive to the light that more backlights 220 send is applied to fingerprint image acquisition, be conducive to obtaining more preferably
Fingerprint image.
In the present embodiment, backlight 220 is point source, such as, can be a LED.Described LED
The light of lamp can be black light, purple light, blue light, green light, sodium yellow, red light, the reddest
Outer light or white light.
In the present embodiment, the first transparent substrates 200 and the second direct stacking of transparent substrates 212, " direct layer
Folded " refer to the first transparent substrates 200 and the second transparent substrates 212 at least part contact, when both are
During tlat substrate, stacking form as shown in Figure 3 can be precisely.
In other embodiments, can be the first transparent substrates and the second transparent substrates is directly pasted." directly glue
Patch " time, glue-line lamination adhesive can be passed through between the first transparent substrates and the second transparent substrates.Glue-line can
To be optical cement layer, the material of optical cement layer can be specifically temperature-sensitive optical cement layer, Photosensitive optical glue-line or
Optics two-sided tape.
In the optical fingerprint sensor module that the present embodiment is provided, by arranging the second transparent substrates 212
It is positioned at below the first transparent substrates 200, backlight 220 is set and is positioned at below the first transparent substrates 200,
And backlight 220 is positioned at the side of the second transparent substrates 212, fingerprint sensing layer 211 is positioned at described
Two transparent substrates 212 lower surfaces.This structure makes light that backlight 220 sends saturating through first
When photopolymer substrate upper surface reflects, need also cross the second transparent substrates 212 and the first transparent substrates
200 just can arrive fingerprint sensing layer 211.Now, described optical fingerprint sensor module takes full advantage of
The thickness of two transparent substrates 212 self, therefore in the case of need not increase extra transparent substrates, just
Finger print can be made just can to increase to the distance between fingerprint sensing layer 211, expand fingerprint sensing
Layer 211 receives the width of ray regions, thus improves the fingerprint image that optical fingerprint sensor module gathers
Quality.
It is to say, in the present embodiment, the light that backlight 320 sends is first from the second transparent substrates 212
Side enters the second transparent substrates 212, enters back into the first transparent substrates 200, and now light is at the first printing opacity
The incident angle b of substrate 200 upper surface can increase accordingly, expands fingerprint sensing layer 211 and receives light
(it is width B that fingerprint sensing layer 211 receives the width of ray regions to the width in line region, comparison diagram 1 and figure
3 understand width B much larger than width A), thus improve the fingerprint image that optical fingerprint sensor module gathers
Quality.
Meanwhile, in the present embodiment, after the light that backlight 220 sends passes through the second transparent substrates 212,
When entering back into the first transparent substrates 200, respective ray of light is used for connecing in the first transparent substrates 200 upper surface
Angle formed by the region of fingertip stricture of vagina is acute angle.Now, the light that backlight 220 sends can be by accordingly
Side-play amount (described side-play amount refers to the horizontal direction offset distance in Fig. 3) at the first transparent substrates 200
There is the phenomenons such as reflection and refraction in the interface of upper surface and finger print, and makes major part effectively reflect light
It is irradiated in the photosensitive region of optical fingerprint sensor 210 (specifically be irradiated to from the basic phase of corresponding pip
With in the photosensitive pixel at offset distance), therefore, whole optical fingerprint sensor module need not light guide plate
With structures such as collecting lenses, it becomes possible to realize the identification of fingerprint image, form fingerprint image clearly, and
And simplify structure, reduce cost.
More importantly, owing to the position of fingerprint sensing layer 211 and the second transparent substrates 212 is switched
Come over, fingerprint sensing layer 211 is arranged on the second transparent substrates 212 lower surface, former according to geometric optics
Reason understands, and in Fig. 3, the light of backlight 220 enters the first transparent substrates 200 before by the second printing opacity
Substrate 212 is adjusted itself, and therefore, respective ray of light is at the angle of incidence of the first transparent substrates 200 upper surface
Degree b can increase, therefore, corresponding incident ray be more prone at the first transparent substrates 200 upper surface and
The interface of air can be totally reflected, and at finger print and the first transparent substrates 200 upper surface
Interface the most normally carry out reflecting and the optical phenomena such as refraction, now, the not coordination of finger print image
Putting (i.e. paddy position and ridge position) contrast can be obviously improved, fingerprint image quality improves.
Second embodiment of the invention provides another kind of optical fingerprint sensor module, refer to Fig. 4.Fig. 4 is
The generalized section of described optical fingerprint sensor module.Described optical fingerprint sensor module includes first
Transparent substrates the 311, second transparent substrates 312, backlight and fingerprint sensing layer 313.Second transparent substrates
312 are positioned at below the first transparent substrates 311.Backlight also is located at below the first transparent substrates 311.Backlight
Source is positioned at the side of the second transparent substrates 312.Fingerprint sensing layer 313 is positioned at the second transparent substrates 312 times
Surface.
In the present embodiment, the first transparent substrates the 311, second transparent substrates 312 and 313 groups of fingerprint sensing layer
Become optical fingerprint sensor (mark).I.e. different from first embodiment, the first transparent substrates 311 is also
A part for optical fingerprint sensor.
In the present embodiment, optical fingerprint sensor can be based on glass substrate with the making of TFT technique
Imageing sensor.
In other embodiments, optical fingerprint sensor can include other structure.Work as optical fingerprint sensor
When can include other structure, the first transparent substrates, the second transparent substrates and fingerprint sensing layer are that optics refers to
A part for stricture of vagina sensor, i.e. optical fingerprint sensor include the first transparent substrates, the second transparent substrates and
Fingerprint sensing layer, and also other structure can be included.
Turning back to reference to Fig. 3, owing to the emergent light of the point sources such as LED has certain angle of divergence, when only having
(it is referred to previous embodiment corresponding when one LED is as backlight (such as backlight source 220)
Content), the emergent light of backlight and reflection light are bigger with directional light difference.It is to say, be irradiated to first
The angle of transparent substrates 311 upper surface light everywhere has bigger difference, ultimately results in different pip
The deviation distance that reflection light incides optical fingerprint sensor photosensitive pixel is different, so that fingerprint image meeting
There is distortion.
In order to solve above-mentioned fingerprint image aberration problems, in the present embodiment, described backlight includes four LED
Lamp, owing to plane shows, only show two LED therein in section shown in Fig. 4, point
Wei LED 320 and LED 330.Four LED are evenly distributed on the first transparent substrates 311
Lower section, be evenly distributed on optical fingerprint sensor side simultaneously, or four lamps be evenly distributed on simultaneously
Four angles of optical fingerprint sensor.Now, although the light that four LED send each is probably
Non-parallel light, but utilize this four LED simultaneously, it is possible to achieve to non-parallel smooth time pattern distortion
Rectification.Concrete, four LED can be taked to adopt figure in turn and (adopt figure in turn and refer to four lamps chronologically
Successively carry out respectively adopting figure) mode, then by image procossing, do distortion correction, improve fingerprint image
Picture element amount, improves fingerprint recognition accuracy.
In the present embodiment, the light of LED can be black light, purple light, blue light, green light,
Sodium yellow, red light, near infrared light or white light.
In other embodiments, backlight can also include that two LED, two LED are evenly distributed on
The lower section of the first transparent substrates 311.Such as, one of them LED is positioned on the left of optical fingerprint sensor
Limit, another LED is positioned at optical fingerprint sensor right edge, is also carried out adopting in turn figure.Other is implemented
In example, backlight can include more than three LED, and it is saturating that more than three LED are evenly distributed on first
The lower section of photopolymer substrate 311, is also carried out adopting in turn figure.
In other embodiments, when the vertical view figure of optical fingerprint sensor is regular polygon, in order to make
Multiple LED are evenly distributed on the lower section of the first transparent substrates 311, overlook on direction, so that
Corresponding multiple LED, with the vertical view centre of figure of optical fingerprint sensor as point of symmetry, is centrosymmetric
Or axisymmetric mode, is evenly distributed on optical fingerprint sensor periphery.When being uniformly distributed, can make
Obtain spacing between adjacent LED lamp equal.
In the present embodiment, by control LED 320, LED 330 and two other do not demonstrate
The light direction of LED and rising angle scope so that light (as shown by the arrows in figure 4) only can
First enter from the side of the second transparent substrates the second transparent substrates (light such as making backlight send only according to
Penetrate the side of the second transparent substrates), enter back into the first transparent substrates.
Structure and the advantage of the optical fingerprint sensor module that more the present embodiment are provided are referred to aforementioned
Embodiment corresponding contents.
Third embodiment of the invention provides another kind of optical fingerprint sensor module, refer to Fig. 5.Fig. 5 is
The generalized section of described optical fingerprint sensor module.Described optical fingerprint sensor module includes first
Transparent substrates the 400, second transparent substrates 412, backlight 420 and fingerprint sensing layer 411.Second printing opacity
Substrate 412 is positioned at below the first transparent substrates 400.Backlight 420 also is located at the first transparent substrates 400
Lower section.Backlight 420 is positioned at the side of the second transparent substrates 412.Fingerprint sensing layer 411 is positioned at second
Transparent substrates 412 lower surface.
In the present embodiment, the second transparent substrates 412 and fingerprint sensing layer 411 form optical fingerprint sensor
410, i.e. identical with first embodiment, the first transparent substrates 400 is not belonging to optical fingerprint sensor 410
A part.
In the present embodiment, the side tool that the second transparent substrates 412 emits beam for receiving backlight 420
The light having light antireflection layer 430, light antireflection layer 430 can increase backlight 420 enters the second transparent substrates
The ratio of 412, thus be conducive to the fingerprint image obtaining becoming apparent from, improve described optical fingerprint sensor
The performance of module.
Structure and the advantage of the optical fingerprint sensor module that more the present embodiment are provided are referred to aforementioned
Embodiment corresponding contents.
Fourth embodiment of the invention provides another kind of optical fingerprint sensor module, refer to Fig. 6.Fig. 6 is
The generalized section of described optical fingerprint sensor module.Described optical fingerprint sensor module includes first
Transparent substrates the 500, second transparent substrates 512, backlight 520 and fingerprint sensing layer 511.Second printing opacity
Substrate 512 is positioned at below the first transparent substrates 500.Backlight 520 also is located at the first transparent substrates 500
Lower section.Backlight 520 is positioned at the side of the second transparent substrates 512.Fingerprint sensing layer 511 is positioned at second
Transparent substrates 512 lower surface.
In the present embodiment, the second transparent substrates 512 and fingerprint sensing layer 511 form optical fingerprint sensor
510, i.e. identical with first embodiment, the first transparent substrates 500 is not belonging to optical fingerprint sensor 510
A part.
In the present embodiment, there is before the exiting surface of backlight 520 collecting lens 530, collecting lens 530
The light that can make backlight 520 be converted to directional light or nearly directional light (described nearly directional light refer to light it
Between angle difference less than 10 degree), the light of backlight 520 is introduced into collecting lens 530, enters back into the
Two transparent substrates 512.I.e. increasing collecting lens 530, making incident illumination is parallel or near directional light, thus solves
The certainly problem of fingerprint image distortion.
Structure and the advantage of the optical fingerprint sensor module that more the present embodiment are provided are referred to aforementioned
Embodiment corresponding contents.
Fifth embodiment of the invention provides another kind of optical fingerprint sensor module, refer to Fig. 7.Fig. 7 is
The generalized section of described optical fingerprint sensor module.Described optical fingerprint sensor module includes first
Transparent substrates the 600, second transparent substrates 612, backlight 620 and fingerprint sensing layer 611.Second printing opacity
Substrate 612 is positioned at below the first transparent substrates 600.Backlight 620 also is located at the first transparent substrates 600
Lower section.Backlight 620 is positioned at the side of the second transparent substrates 612.Fingerprint sensing layer 611 is positioned at second
Transparent substrates 612 lower surface.
In the present embodiment, the second transparent substrates 612 and fingerprint sensing layer 611 form optical fingerprint sensor
610, i.e. identical with first embodiment, the first transparent substrates 600 is not belonging to optical fingerprint sensor 610
A part.
In the present embodiment, the side that the second transparent substrates 612 emits beam for receiving backlight is optically focused
Face (does not marks), and the light that backlight is sent by caustic surface is converted to directional light or nearly directional light, thus carries
High fingerprint imaging quality.
In the present embodiment, described caustic surface is ellipsoid crown.In other embodiments, caustic surface can also be
Inclined-plane, spherical crown surface, ellipsoid crown, conical side surface or pyramid side.
It should be noted that in other embodiments, caustic surface can have light antireflection layer and (refer to the 3rd
Embodiment), the light that described smooth antireflection layer can increase backlight 620 enters the second transparent substrates 612
Ratio, thus increase fingerprint image signal value.
Structure and the advantage of the optical fingerprint sensor module that more the present embodiment are provided are referred to aforementioned
Embodiment corresponding contents.
Although present disclosure is as above, but the present invention is not limited to this.Any those skilled in the art,
Without departing from the spirit and scope of the present invention, all can make various changes or modifications, therefore the guarantor of the present invention
The scope of protecting should be as the criterion with claim limited range.
Claims (12)
1. an optical fingerprint sensor module, including:
First transparent substrates；
Second transparent substrates, is positioned at below described first transparent substrates；
Backlight, is positioned at below described first transparent substrates；
It is characterized in that,
Described backlight is positioned at the side of described second transparent substrates；
Described optical fingerprint sensor module also includes that fingerprint sensing layer, described fingerprint sensing layer are positioned at described
Two transparent substrates lower surfaces.
2. optical fingerprint sensor module as claimed in claim 1, it is characterised in that described backlight sends
Light enter described second transparent substrates from the side of described second transparent substrates, then from described second
Transparent substrates enters described first transparent substrates, and in described first transparent substrates upper surface generation part
Reflection, reflection light returns to enter described second transparent substrates through after described first transparent substrates,
Described fingerprint sensing layer is entered again from described second transparent substrates.
3. optical fingerprint sensor module as claimed in claim 2, it is characterised in that described second printing opacity base
The side of plate is on-right angle with the angle of described second transparent substrates upper surface.
4. optical fingerprint sensor module as claimed in claim 3, it is characterised in that described first printing opacity base
Plate is single layer structure or multiple structure；Described first transparent substrates lower surface has light shield layer, described
The light that light shield layer sends for preventing described backlight is in the advance being introduced into described second transparent substrates
Enter described first transparent substrates.
5. optical fingerprint sensor module as claimed in claim 4, it is characterised in that when described first printing opacity
When substrate is single layer structure, described first transparent substrates upper surface, described first transparent substrates lower surface,
Described second transparent substrates upper surface and at least one of which surface of described second transparent substrates lower surface
There is filter layer；When described first transparent substrates is multiple structure, described first transparent substrates comprises
Multiple submounts, described submounts upper surface, described submounts lower surface, described second transparent substrates
At least one of which surface of upper surface and described second transparent substrates lower surface has filter layer.
6. optical fingerprint sensor module as claimed in claim 1, it is characterised in that described second printing opacity base
Plate and described fingerprint sensing layer composition optical fingerprint sensor；Or, described first transparent substrates, institute
State the second transparent substrates and described fingerprint sensing layer composition optical fingerprint sensor.
7. the optical fingerprint sensor module as described in claim 1-6 any one, it is characterised in that described
Having collecting lens before the exiting surface of backlight, described collecting lens can make the light of described backlight
Line is converted to directional light or nearly directional light, and the light of described backlight first passes through described collecting lens, then
Arrive the side of described second transparent substrates.
8. the optical fingerprint sensor module as described in claim 1-6 any one, it is characterised in that described
The side that second transparent substrates emits beam for receiving backlight has light antireflection layer, and described light is anti-reflection
Layer can increase the ratio of light described second transparent substrates of entrance of described backlight.
9. the optical fingerprint sensor module as described in claim 1-6 any one, it is characterised in that described
The side that second transparent substrates emits beam for receiving backlight is caustic surface, and described caustic surface is by institute
State the light that backlight sends and be converted to directional light or nearly directional light.
10. optical fingerprint sensor module as claimed in claim 9, it is characterised in that described caustic surface is oblique
Face, spherical crown surface, ellipsoid crown, conical side surface or pyramid side.
11. optical fingerprint sensor modules as claimed in claim 9, it is characterised in that described caustic surface has
Light antireflection layer, described smooth antireflection layer can increase the light of described backlight and enter described light transmission medium
Ratio.
The 12. optical fingerprint sensor modules as described in claim 1-6 any one, it is characterised in that described
Backlight includes that plural LED, said two or two or more LED are evenly distributed
In the lower section of described protective layer, the light of described LED is black light, purple light, blue light, green
Coloured light, sodium yellow, red light, near infrared light or white light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610637766.XA CN106022325B (en) | 2016-08-05 | 2016-08-05 | Optical fingerprint sensor mould group |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610637766.XA CN106022325B (en) | 2016-08-05 | 2016-08-05 | Optical fingerprint sensor mould group |
Publications (2)
| Publication Number | Publication Date |
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| CN106022325A true CN106022325A (en) | 2016-10-12 |
| CN106022325B CN106022325B (en) | 2019-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610637766.XA Active CN106022325B (en) | 2016-08-05 | 2016-08-05 | Optical fingerprint sensor mould group |
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